4E3 recognizes the human CD25 antigen, a 55 kDa glycoprotein also known as the low-affinity interleukin-2 receptor alpha chain (IL-2Rα). CD25 is expressed on activated T and B cells, on macrophages, and on a subset of non-activated CD4+ regulatory T cells. The CD25 antigen contains three epitope regions called A, B, and C. This CD25 antibody recognizes epitope region B.

M-T271 recognizes CD27, a member of the tumor necrosis factor receptor family. CD27 is expressed at differing levels on memory B cells, a fraction of plasma cells, and on naive and memory T cells, but is not expressed on naive B cells or effector T cells. It is also expressed on NK cells. CD27 therefore represents a useful marker to distinguish certain T and B cell subsets from each other.

REA414 recognizes the human CD66c antigen, a glycosylphosphatidylinositol (GPI) linked protein, which is also known as carcinoembryonic antigen-related cell adhesion molecule 6 (CEACAM6). Within the hematopoietic system, CD66c expression is limited to granulocytes and its precursors, where it serves homotypic and heterotypic adhesion, Ca2+ mediated signaling, and is markedly upregulated from intracellular stores after activation. It is also found in epithelia of various organs. CD66c overexpression is found in a wide variety of epithelial cancer types such as lung, breast, colorectal, and hepatocellular carcinomas.Additional information: Clone REA414 displays negligible binding to Fc receptors.

The monoclonal antibody UP-H2 reacts with human CD300e, also known as IREM-2, LMIR6, or CMRF35-A5. This 34 kDa activating receptor of the immunoglobulin superfamily is expressed on mature myeloid dendritic cells and monocytes and is down-regulated on immature dendritic cells. CD300e interacts with DAP-12, which mediates activating signals. It is reported that the alloreactive response of naive T cells is enhanced by IREM-2 activation of mDCs.

REA613 recognizes the human CD3 antigen, a single-pass type I membrane protein, also known as Leu4. CD3 is present on mature human T cells, thymocytes, a subset of NK cells, and on Purkinje cells in cerebellum. It is associated with the T cell receptor (TCR) and is responsible for its signal transduction. The CD3 antigen is a complex of five invariable chains: gamma, delta, epsilon, zeta and eta. The epitope recognized by the antibody is located on the epsilon-chain of the CD3 complex. Additional information: Clone REA613 displays negligible binding to Fc receptors.

REA613 recognizes the human CD3 antigen, a single-pass type I membrane protein, also known as Leu4. CD3 is present on mature human T cells, thymocytes, a subset of NK cells, and on Purkinje cells in cerebellum. It is associated with the T cell receptor (TCR) and is responsible for its signal transduction. The CD3 antigen is a complex of five invariable chains: gamma, delta, epsilon, zeta, and eta. The epitope recognized by the antibody is located on the epsilon-chain of the CD3 complex. Additional information: Clone REA613 displays negligible binding to Fc receptors.

VIT4 recognizes the human CD4 antigen which is highly expressed on human T helper cells and thymocytes, and at lower levels on monocytes and dendritic cells. It is responsible for the recognition of the MHC Class II antigen.

LT19 recognizes the human CD19 antigen, a type-I transmembrane glycoprotein of 95 kDa that belongs to the immunoglobulin superfamily. CD19 is expressed on B cells throughout most stages of B cell differentiation, though its expression is down-regulated during their terminal differentiation to plasma cells. Expression of CD19 is also found in the majority of B cell–derived malignancies. CD19 is further present on follicular dendritic cells. On B cells, CD19 associates with CD21, CD81, and CD225 (Leu-13) forming a signal transduction complex.

LT20 recognizes the CD20 antigen, a non-glycosylated transmembrane protein of 33–37 kDa that is expressed on B lineage cells from the pre-B cell stage to the B cell lymphoblast stage. The antigen is further expressed on most malignant B cells. CD20 is not found on early B cell progenitors or plasma cells. Oligomers of CD20 form a Ca2+ channel and might function in the regulation of local responses during B cell activation.

LT20 recognizes the CD20 antigen, a non-glycosylated transmembrane protein of 33–37 kDa that is expressed on B lineage cells from the pre-B cell stage to the B cell lymphoblast stage. The antigen is further expressed on most malignant B cells. CD20 is not found on early B cell progenitors or plasma cells. Oligomers of CD20 form a Ca2+ channel and might function in the regulation of local responses during B cell activation.

Clone REA570 recognizes the human CD25 glycoprotein, also known as the low-affinity interleukin-2 receptor alpha chain (IL-2Ralpha). It associates with IL-2 receptor beta (CD122) and gamma chains (CD132) to form a high affinity IL-2R complex. CD25 is expressed on activated T and B cells, on macrophages, and on a subset of non-activated CD4+ regulatory T cells. Clone REA570 recognizes epitope region A. Additional information: Clone REA570 displays negligible binding to Fc receptors

5B1 recognizes the human CD45 antigen, a tyrosine phosphatase also known as the leukocyte common antigen (LCA). The CD45 molecule is required for T and B cell activation and is expressed in at least five isoforms depending on the differentiation status of the cell. The CD45 antibody recognizes a common epitope of all CD45 isoforms.

5B1 recognizes the human CD45 antigen, a tyrosine phosphatase also known as the leukocyte common antigen (LCA). The CD45 molecule is required for T and B cell activation and is expressed in at least five isoforms depending on the differentiation status of the cell. The CD45 antibody recognizes a common epitope of all CD45 isoforms.

5B1 recognizes the human CD45 antigen, a tyrosine phosphatase also known as the leukocyte common antigen (LCA). The CD45 molecule is required for T and B cell activation and is expressed in at least five isoforms depending on the differentiation status of the cell. The CD45 antibody recognizes a common epitope of all CD45 isoforms.

BW264/56 recognizes the human CD3 antigen which is present on mature human T cells, thymocytes, and a subset of NK cells. CD3 is associated with the T cell receptor (TCR) and is responsible for its signal transduction. The CD3 antigen is a complex of five invariable chains: gamma, delta, epsilon, zeta and eta. The epitope recognized by the antibody is located on the epsilon-chain of the CD3 complex.

Clone REA423 recognizes the human CD16 antigen, a single-pass type I membrane protein which is also known as low affinity immunoglobulin gamma Fc region receptor III (FcRIII). CD16 is a 50–80 kDa glycoprotein that is expressed in two different isoforms. The transmembrane form is found on human NK cells, macrophages, and mast cells, while the glycosylphosphatidylinositol (GPI)-linked form is present on neutrophils. The human CD16 antigen is a low-affinity receptor for aggregated IgG. The transmembrane form plays a role in signal transduction, NK cell activation, and antibody-dependent cellular cytotoxicity. Clone REA423 recognizes both the extracellular domain of the transmembrane form as well as the GPI-linked form of the human CD16 antigen. CD16 is expressed on the majority of rhesus monkey NK cells and on a subset of monocytes but not on granulocytes. Additional information: Clone REA423 displays negligible binding to Fc receptors.

REA675 recognizes the human CD19 antigen, a type I transmembrane glycoprotein of 95 kDa that belongs to the immunoglobulin superfamily. CD19 is expressed on B cells throughout most stages of B cell differentiation, though its expression is down-regulated during their terminal differentiation to plasma cells. Expression of CD19 is also found in the majority of B cell–derived malignancies. CD19 is further present on follicular dendritic cells. On B cells, CD19 associates with CD21, CD81, and CD225 (Leu-13) forming a signal transduction complex. Additional information: Clone REA675 displays negligible binding to Fc receptors.

REA675 recognizes the human CD19 antigen, a type I transmembrane glycoprotein of 95 kDa that belongs to the immunoglobulin superfamily. CD19 is expressed on B cells throughout most stages of B cell differentiation, though its expression is down-regulated during their terminal differentiation to plasma cells. Expression of CD19 is also found in the majority of B cell–derived malignancies. CD19 is further present on follicular dendritic cells. On B cells, CD19 associates with CD21, CD81, and CD225 (Leu-13) forming a signal transduction complex. Additional information: Clone REA675 displays negligible binding to Fc receptors.

Clone REA671 recognizes the human CD38 antigen, a single-chain type II transmembrane glycoprotein with enzymatic activity. It is present on the majority of hematopoietic cells, prevalent during early differentiation and activation processes. Terminally differentiated B cells (plasma cells) express CD38 brightly. Furthermore, CD38 is constitutively expressed in several tissues, for example, brain, muscle, and kidney. CD38, a disease marker for human leukemias and myelomas, plays a role in the pathogenesis and outcome of human immunodeficiency virus infection and chronic lymphocytic leukemia, and controls insulin release and also the development of diabetes. Furthermore, it catalyzes the synthesis and hydrolysis of cyclic ADP-ribose (cADPR) from NAD+ to ADP-ribose which is essential for the regulation of intracellular Ca2+. Additional information: Clone REA671 displays negligible binding to Fc receptors.

REA652 recognizes the human alpha/beta T cell receptor (TCR). The T cell receptor is a heterodimer composed of two transmembrane glycoprotein chains, alpha and beta. In 95% of T cells the TCR consists of an alpha and beta chain, whereas in 5% of T cells it has gamma and delta chains. Alpha and beta chains are members of the Ig superfamily and consist of a constant and a polymorphic variable region. The variable region of the TCRalpha/beta is involved in recognition of antigenic peptides presented by the MHC complex of antigen-presenting cells. Additional information: Clone REA652 displays negligible binding to Fc receptors.

REA652 recognizes the human alpha/beta T cell receptor (TCR). The T cell receptor is a heterodimer composed of two transmembrane glycoprotein chains, alpha and beta. In 95% of T cells the TCR consists of an alpha and beta chain, whereas in 5% of T cells it has gamma and delta chains. Alpha and beta chains are members of the Ig superfamily and consist of a constant and a polymorphic variable region. The variable region of the TCRalpha/beta is involved in recognition of antigenic peptides presented by the MHC complex of antigen-presenting cells. Additional information: Clone REA652 displays negligible binding to Fc receptors.

11F2 recognizes the human gamma/delta T cell receptor (TCR). The T cell receptor is a heterodimeric glycoprotein associated with the CD3 antigen. The TCR consists of a alpha and a beta chain (TCRa/b) or a gamma and a delta chain (TCRg/d). Clone 11F2 reacts with a framework epitope of the gamma/delta T cell–receptor. The gamma and delta TCR chains are composed of constant and variable regions, each encoded by distinct gene segments. The gamma chain forms either disulfide-linked or non-disulfide-linked heterodimers with the delta-subunit. The gamma/delta T cell–receptor is present on a subset of T lymphocytes in peripheral blood, intestinal epithelium, lymph node, thymus, and spleen. TCR gamma/delta is involved in the recognition of certain bacterial, self-CD1 molecule, and tumor antigens bound to MHC class I. Gamma/delta T cells are mainly CD4 negative and CD8 negative. T cells expressing the gamma/delta TCR have been shown to play a role in oral tolerance, innate immune response for some tumor cells, and autoimmune disease. Antigen presentation by gamma/delta T cells has been reported.

REA599 recognizes the human CD14 antigen. CD14 is part of the functional heteromeric LPS receptor complex comprised of at least CD14, TLR4, and MD-2. It up-regulates cell surface molecules, including adhesion molecules. CD14 is strongly expressed on most human monocytes and macrophages in peripheral blood, other bodily fluids, and in various tissues, such as lymph nodes and spleen. CD14 is weakly expressed on subpopulations of human neutrophils and myeloid dendritic cells. Additional information: Clone REA599 displays negligible binding to Fc receptors.

BW135/80 recognizes the human CD8 antigen which is strongly expressed on human cytotoxic T cells and thymocytes, and is also expressed on a subset of NK cells. The CD8 antigen is a disulfide-linked dimer that exists either as a CD8alpha homodimer or as a CD8alpha/beta heterodimer. CD8 acts as a coreceptor for the T cell receptor and binds to the MHC Class I molecule. The CD8 antibody recognizes the alpha-subunit of the antigen.

REA780 recognizes the human CD20 antigen, a non-glycosylated transmembrane protein of 33–37 kDa that is expressed on B lineage cells from the pre–B cell stage to the B cell lymphoblast stage. The antigen is further expressed on most malignant B cells. CD20 is not found on early B cell progenitors or plasma cells. Oligomers of CD20 form a Ca2+ channel and might function in the regulation of local responses during B cell activation.Additional information: Clone REA780 displays negligible binding to Fc receptors.

REA734 recognizes the human CD8 antigen, a cell-surface glycoprotein also known as Leu-2 or CD8a. CD8 is strongly expressed on human cytotoxic T cells and thymocytes as well as on a subset of NK cells. The CD8 antigen is a disulfide-linked dimer that exists either as a CD8a homodimer or as a CD8alpha/beta heterodimer. CD8 acts as a co-receptor for the T cell receptor and binds to the MHC class I molecules. CD8 is involved in T cell development and activation of mature T cells. The CD8 antibody recognizes the alpha-subunit of the antigen. Additional information: Clone REA734 displays negligible binding to Fc receptors.

REA675 recognizes the human CD19 antigen, a type I transmembrane glycoprotein of 95 kDa that belongs to the immunoglobulin superfamily. CD19 is expressed on B cells throughout most stages of B cell differentiation, though its expression is down-regulated during their terminal differentiation to plasma cells. Expression of CD19 is also found in the majority of B cell–derived malignancies. CD19 is further present on follicular dendritic cells. On B cells, CD19 associates with CD21, CD81, and CD225 (Leu-13) forming a signal transduction complex. Additional information: Clone REA675 displays negligible binding to Fc receptors.

REA747 recognizes the human CD45 antigen, a member of the protein tyrosine phosphatase (PTP) family, also known as the leukocyte common antigen (LCA). The CD45 molecule a type I transmembrane protein which is required for T and B cell activation and involved in cell growth, differentiation, mitotic cycle, and oncogenic transformation. CD45 is expressed in different isoforms (CD45RA, CD45RB, CD45RC, CD45RAB, CD45RAC, CD45RBC, CD45RO, CD45R (ABC)) depending on the differentiation status of the cell. The CD45 antibody recognizes a common epitope of all CD45 isoforms. Additional information: Clone REA747 displays negligible binding to Fc receptors.

REA747 recognizes the human CD45 antigen, a member of the protein tyrosine phosphatase (PTP) family, also known as the leukocyte common antigen (LCA). The CD45 molecule a type I transmembrane protein which is required for T and B cell activation and involved in cell growth, differentiation, mitotic cycle, and oncogenic transformation. CD45 is expressed in different isoforms (CD45RA, CD45RB, CD45RC, CD45RAB, CD45RAC, CD45RBC, CD45RO, CD45R (ABC)) depending on the differentiation status of the cell. The CD45 antibody recognizes a common epitope of all CD45 isoforms. Additional information: Clone REA747 displays negligible binding to Fc receptors.

AC136 recognizes the human CD34, a class III epitope of the CD34 antigen. This epitope is different than the one recognized by the clone used in the CD34 MicroBead Kits. The CD34 antigen is a single-chain transmembrane glycoprotein, expressed on human hematopoietic stem and progenitor cells, endothelial progenitor cells, vascular endothelial cells, embryonic fibroblasts, and some cells in fetal and adult nervous tissue. The antigen is absent on fully differentiated hematopoietic cells, such as normal peripheral blood lymphocytes, monocytes, granulocytes, erythrocytes, and platelets. Clone AC136 has a similar specificity as the CD34 monoclonal antibody clone 8G12 (HPCA-2). CD34 antibodies can be used for studies of hematopoiesis and nonhematopoietic stem cells, phenotyping of hematopoietic stem cells, and studies on phenotyping of hematologic malignancies, endothelial cells, and endothelial progenitor cells (EPCs).

T6D11 recognizes the human CD45RA antigen which is expressed on naive CD4+ and CD8+ T cells as well as on CD8+ effector T cells. CD45RA is also present on subsets of B and NK cells as well as on plasmacytoid dendritic cells. The CD45RA antibody recognizes the 220 kDa isoform of the leukocyte common antigen (LCA), a transmembrane tyrosine phosphatase.

145/15 recognizes the human CD62L antigen, a 74 kDa glycoprotein and a member of the selectin family of cell surface molecules. CD62L is also known as L-selectin, LECAM-1, or LAM-1 and binds a series of glycoproteins including CD34, GlyCAM-1, and MAdCAM-1. CD62L is important for homing of naive lymphocytes via endothelial venules to peripheral lymph nodes and Peyer’s patches. The CD62L antigen also contributes to the recruitment of leukocytes from the blood to areas of inflammation. Most hematopoietic cells express CD62L, including many peripheral blood B cells, T cells, monocytes, granulocytes, and some myeloid cells from bone marrow, and thymocytes. CD62L is continuously endoproteolytically cleaved from the cell surface neutrophils and lymphocytes (shedding). Proteolysis is accelerated, for example, after antigenic activation of T cells. Always use fresh material for immunofluorescent staining of CD62L+ cells. For optimal results, the cells should not be older than 8–12 hours. Keep cells continuously cold. CD62L-expression may be rapidly lost due to shedding.

145/15 recognizes the human CD62L antigen, a 74 kDa glycoprotein and a member of the selectin family of cell surface molecules. CD62L is also known as L-selectin, LECAM-1, or LAM-1 and binds a series of glycoproteins including CD34, GlyCAM-1, and MAdCAM-1. CD62L is important for homing of naive lymphocytes via endothelial venules to peripheral lymph nodes and Peyer’s patches. The CD62L antigen also contributes to the recruitment of leukocytes from the blood to areas of inflammation. Most hematopoietic cells express CD62L, including many peripheral blood B cells, T cells, monocytes, granulocytes, and some myeloid cells from bone marrow, and thymocytes. CD62L is continuously endoproteolytically cleaved from the cell surface neutrophils and lymphocytes (shedding). Proteolysis is accelerated, for example, after antigenic activation of T cells. Always use fresh material for immunofluorescent staining of CD62L+ cells. For optimal results, the cells should not be older than 8–12 hours. Keep cells continuously cold. CD62L-expression may be rapidly lost due to shedding.

REA546 recognizes the human CD197 antigen, which is also known as CCR7. CD197 is a chemokine receptor with a C-C motif that mediates homing of T cells to secondary lymphoid organs via high endothelial venules (HEV). For example, naive T cells migrate very efficiently through lymph nodes using the adhesion molecules L-selectin, CD62L, and CCR7. Ligands for CCR7, e.g. CCL19, are expressed by the HEV of secondary lymphoid organs, by parenchymal cells within T cell zones of lymph nodes, and by endothelial cells at the openings of lymphatic vessels within peripheral tissues. Expression of CCR7 and the CD45RA isoform distinguishes three subsets of T cells: naive T cells (CCR7+CD45RA+), central memory T cells (CCR7+ CD45RA-), and effector memory T cells (CCR7- CD45RA-). Additional information: Clone REA546 displays negligible binding to Fc receptors.

REA623 recognizes the human CD4 antigen, a 55 kDa single-pass type I membrane protein, also known as T4/Leu-3. CD4 is highly expressed on T helper cells and at a lower level on monocytes and dendritic cells. It is involved in the recognition of MHC class ll/peptide complexes by the TCR heterodimers and is the receptor for the human immunodeficiency virus (HIV). Additional information: Clone REA623 displays negligible binding to Fc receptors.

11F2 recognizes the human gamma/delta T cell receptor (TCR). The T cell receptor is a heterodimeric glycoprotein associated with the CD3 antigen. The TCR consists of a alpha and a beta chain (TCRa/b) or a gamma and a delta chain (TCRg/d). Clone 11F2 reacts with a framework epitope of the gamma/delta T cell–receptor. The gamma and delta TCR chains are composed of constant and variable regions, each encoded by distinct gene segments. The gamma chain forms either disulfide-linked or non-disulfide-linked heterodimers with the delta-subunit. The gamma/delta T cell–receptor is present on a subset of T lymphocytes in peripheral blood, intestinal epithelium, lymph node, thymus, and spleen. TCR gamma/delta is involved in the recognition of certain bacterial, self-CD1 molecule, and tumor antigens bound to MHC class I. Gamma/delta T cells are mainly CD4 negative and CD8 negative. T cells expressing the gamma/delta TCR have been shown to play a role in oral tolerance, innate immune response for some tumor cells, and autoimmune disease. Antigen presentation by gamma/delta T cells has been reported.

REA1047 recognizes the human CD45FtA antigen, which is expressed on naive CD4+ and CD8+ T cells as well as on CD8+ effector T cells. CD45RA is also present on subsets of B and NK cells as well as on plasmacytoid dendritic cells. The CD45FtA antibody recognizes the 220 kDa isoform of the leukocyte common antigen (LCA), a transmembrane tyrosine Phosphatase. Additional information: Clone REA1047 displays negligible binding to Fc receptors.

Aged human EDTA-treated whole blood samples (6 days old) were stained with 7-AAD Staining Solution using a lyse-wash procedure and analyzed by flow cytometry using the MACSQuant® Analyzer. For analysis, white blood cells were gated based on forward and side scatter properties and after exclusion of cell debris and red blood cells based on scatter signals. Dead and apoptotic cells were identified by 7-AAD fluorescence.